thangvietnam
Pls, give us full explanation/rule for the cases above. Thank you.
Hi there,
We can decide when to use “to verb” and when to use “for verb-ing” by understanding the context of the sentence.
a. Use “to verb” to present purpose or intention of any action.
b. Use “for verb-ing” to not present the purpose or intention. Use this expression to show that the action is somehow related to the “verb-ing”.
Now let’s apply these guidelines to the official sentences that you have provided:
New genetic evidence - together with recent studies of elephants' skeletons, tusks, and other anatomical features - provide compelling support for classifying Africa's forest elephants and its savanna elephants as separate species.
D. provides compelling support for classifying
E. provides compelling support to classify
So how to choose between the two? Let’s first take
choice E. In this choice “to verb” has been used “provides compelling support”. So the sentence is saying that new genetic evidence provide compelling support with the intention to classify something. Does this make sense? New evidence provides support with some intention? This meaning certainly does not make any logical sense. Hence, choice E is eliminated.
So now, even if we are left with
choice D, which is the correct answer, let’s see why it is correct. The sentence per this choice means new genetic evidence provides support. And what does it provide support for? It provides support for classifying something. So providing support is related to classifying something. This makes complete logical sense. So choice D indeed is the correct answer.
Now let’s take a look at the other question:
Warning that computers in the United States are not secure, the National Academy of Sciences has urged the nation to revamp computer security procedures, institute new emergency response teams, creating a special nongovernment organization to take charge of computer security planning.
(D) and create a special nongovernment organization for taking
(E) and create a special nongovernment organization to take
Let’s analyze
choice E first. So the NAS has urged the nation to take three steps. The purpose is presented in “to verb”. The NAS wants the nation to take charge of computer security planning because the computers in the US are not safe. This meaning perfectly makes sense. The intended intention is clearly communicated. Hence choice E is correct.
Choice D fails to communicate this intention. It merely says that NAS urged the nation to do a few things for doing something else. This makes choice D incorrect.
So first let the context of the sentence guide you to the intended meaning and then apply the guidelines to see usage of “to verb” communicates that intended meaning or usage of “for verb-ing” does so.
Hope this helps.
Thanks.
Shraddha